On Thursday, March 8, Microsoft said that just before noon on Tuesday, Windows Defender blocked more than 80,000 instances of a massive malware attack that used a trojan called Dofoil, also known as Smoke Loader. Within the following 12 hours, Windows Defender blocked another 400,000 instances. Most of the smoky outbreak took place in Russia (73 percent) followed by Turkey (18 percent) and Ukraine (4 percent).
Smoke Loader is a trojan that can retrieve a payload from a remote location once it infects a PC. It was last seen in a fake patch for the Meltdown and Spectre processor vulnerabilities, which downloaded various payloads for malicious purposes. But for the current outbreak in Russia and its neighboring countries, Smoke Loader’s payload was a cryptocurrency miner.
“Because the value of Bitcoin and other cryptocurrencies continues to grow, malware operators see the opportunity to include coin mining components in their attacks,” Microsoft stated. “For example, exploit kits are now delivering coin miners instead of ransomware. Scammers are adding coin mining scripts in tech support scam websites. And certain banking trojan families added coin mining behavior.”
Once on the PC, the Smoke Loader trojan launched a new instance of Explorer in Windows and placed it in a suspended state. The trojan then carved out a portion of the code used it to run in the system memory and filled that blank space with malware. After that, the malware could run undetected and delete the trojan components stored on the PC’s hard drive or SSD.
Now disguised as the typical Explorer process running in the background, the malware launched a new instance of the Windows Update AutoUpdate Client service. Again, a section of the code was carved out, but coin mining malware filled the blank space instead. Windows Defender caught the miner red-handed because its Windows Update-based disguise ran from the wrong location. Network traffic stemming from this instance constituted highly suspicious activity as well.
Because Smoke Loader needs an internet connection to receive remote commands, it relies on a command and control server located within the experimental, open-source Namecoin network infrastructure. According to Microsoft, this server tells the malware to sleep for a period of time, connect or disconnect to a specific IP address, download and execute a file from a specific IP address, and so on.
“For coin miner malware, persistence is key. These types of malware employ various techniques to stay undetected for long periods of time in order to mine coins using stolen computer resources,” Microsoft says. That includes making a copy of itself and hiding out in the Roaming AppData folder and making another copy of itself to access IP addresses from the Temp folder.
Microsoft says artificial intelligence and behavior-based detection helped thwart the Smoke Loader invasion but the company doesn’t state how victims received the malware. One possible method is the typical email campaign as seen with the recent fake Meltdown/Spectre patch, tricking recipients into downloading and installing/opening attachments.
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Touchscreen laptops have been around for years. You can get them in all sizes and shapes. Just not from Apple. For years, the Cupertino giant has treated the idea of a touchscreen MacBook the way I treat a meeting that could have been an email: with open contempt. However, Wednesday looks like the day the company could finally change its mind.
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